body, div, p, ul, li, h1, h2, h3, h4, h5, img{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
.clearfix:after,
.clearfix:before{
    display: block;
    content: "";
    clear: both;
}
ul li{
    list-style: none;
}
.left, .nvwang{
    float: left;
}
.right{
    float: right;
}
img, a{
    display: block;
}
.container{
    width: 1200px;
    margin: auto;

}
.col{
    background-color: #00ff00;
    height: 100px;
    width: 33.333333%;
    float: left;
    border-right: 1px solid #000;
}
@media (max-width:600px) {
    .container{
        width: 90%;
    }
    .col{
        width: 100%;
    }
}